What do I do with this poor baby?

[hollowlaughter]

Honestly, I thought he looked truly terrible. Almost to far gone.

Especially with your description of his weakness and lethargy. They can reach a point where assist feeding (or even force feeding) doesn't work anymore.
Once a animal (or even human) reaches that point of emaciation, organ damage occurs. Oftentimes it is irreversible or even fatal.

Even the animals that DO come back from that, usually have lasting issues.

There is such a thing as "re-feeding syndrome". I'm not sure if snakes can get it, but, it may just affect them. Once the point of organ damage is reached, a feeding can actually cause the organs to shut down completely. Esp. if there was to much food and it overwhelmed the damaged system.

I say it again, this snake should have NEVER been sold. It was obviously a problem hatchling. If it barely weighed 90 gr at over 6 month old, I'd say it never ate on its own. Either way, it was emaciated. The stress of taking it to a show and then having to adjust to a new home, probably made things much worse.

Again, not your fault. The breeder, though....

I'm so sorry. What a terrible experience But please, don't let that put you off from trying again. Make sure you sanitize everything that can be sanitized and throw away the things that can't. And then get a HEALTHY well established hatchling from a good breeder. If you lived close enough to me, I'd give you one. Dedicated owners that are willing to do whatever it takes are what those animals deserve. Don't let this experience turn you off of owning one of those beautiful snakes !

I hope OP goes through steps to demand a refund and if not given it, get in contact with whomever runs the convention this animal was bought at to bring the breeder to their attention. This wouldn't fly at my local one, at least.

This hatchling deserved better than that and its cruel to do to a new hobbyist.